Apple on Thursday released OS X 10.9.3, a minor update for its Mavericks Mac operating system, bringing improved 4K display support for the latest Mac Pro and 15-inch MacBook Pro, along with other bug fixes and improvements.

OS X 10.9.3 is now available to download through the Mac App Store. Apple says the update is recommended for all Mac users, and that it improves the stability, compatibility and security of the operating system.

Other additions and changes in OS X 10.9.3 are:

The ability to sync contacts and calendars between a Mac and an iOS device using a USB connection

Improved reliability of VPN connections using IPsec

Safari 7.0.3 is also included

While the update introduces a "Retina" output mode for the late 2013 15-inch MacBook Pro, it does not grant the same ability to the 13-inch model. Apple's current Thunderbolt Display does not come with a 4K resolution, meaning the support is only available for third-party monitors.

OS X 10.9.3 had a particularly long beta period, with nine pre-release builds being provided to developers before Thursday's official launch to the public.

The launch of OS X 10.9.3 comes less than a month after Apple opened up its beta seed program to all users in exchange for "quality and usability feedback." The program allows anyone, not just Mac developers, to test pre-release versions of OS X.

Can someone check if you can do 4k/60hz on Mac Pro over *hdmi* ? HDMI 1.4 and 2.0 are specs are identical hardware wise, so it´s only a matter of fixing the software. Would be nice with 4k/60hz over HDMI as most TVs dont come with mDP.

Update: looking at the Apple discussion forum thread on the topic linked from the article above, it appears that the vast majority (if not all) of the people experiencing a mirroring problem with 10.9.2 had some kind of 3rd party mirroring application also installed (ex: AirDisplay).

Update: looking at the Apple discussion forum thread on the topic linked from the article above, it appears that the vast majority (if not all) of the people experiencing a mirroring problem with 10.9.2 had some kind of 3rd party mirroring application also installed (ex: AirDisplay).

Figured if anyone follows this site regularly, they would have known which one.

Looking at the Apple discussion forum thread on the topic linked from the article above, it appears that the vast majority (if not all) of the people experiencing a mirroring problem with 10.9.2 had some kind of 3rd party mirroring application also installed (ex: AirDisplay).